Submitted on: 19 November 2004.
Revised on: 01 February 2005.
Accepted on: 28 February 2005.
___________________EUROPEAN JOURNAL OF PUBLIC HEALTH
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Submitted on: 29 July 2012.
Revised on: 12 October 2012.
Accepted on: 07 December 2012.
___________________EUROPEAN JOURNAL OF PUBLIC HEALTH